Matlab files needed to warp the face images. I slightly modified code from: https://www.mathworks.com/matlabcentral/fileexchange/24315-warping-using-thin-plate-splines
They say to cite as: Fitzgerald Archibald (2020). Warping Using Thin Plate Splines (https://www.mathworks.com/matlabcentral/fileexchange/24315-warping-using-thin-plate-splines), MATLAB Central File Exchange. Retrieved [insert date]
Also requires psychtoolbox: http://psychtoolbox.org/download.html